[Bug]: Home Assistant Websocket API not working

[baeroe]

System architecture

Linux

PHP Version

No response

Bug description

Hey guys -

Foremost, great work. I love working with expose. It is a super useful tool.

Currently, I am implementing a Home Assistant Add-On to expose my home assistant running on a Raspberry Pi in my local network without the need of Port Forwarding in the Router. Expose would be great for that, because in combination with the nginx proxy manager you have full control over it, and you do not rely on any environments like Cloudflare.

So I have a nginx proxy manager and the expose server on my VPS. Expose is working perfect for normal http requests. But I think there is a problem with the WebSocket handling in expose. For some reason, I don't get any answers from the expose server when I establish a WebSocket connection.

When access my home assistant with the remote URL I can log in but when I get redirected after entering my credentials and the OAuth process (https://developers.home-assistant.io/docs/api/websocket/) starts, I get a Bad Request after 10 Seconds.
I tried to simulate that process with Postman and I get the same result. I can establish the connection but i don't get any answer of my message:

Here is my nginx proxy configuration:

Here are the logs of the expose client:

Thank you for using expose.
  Shared site              homeassistant:8123      
  Dashboard                http://127.0.0.1:4040      
  Public URL               https://ha.not-my-domain.io
      GET  /api/websocket .............................   07:30:25  17 ms
  101    GET  /api/websocket .............................   07:30:25  78 ms
  101    GET  /api/websocket .............................   07:30:25  78 ms
      GET  /api/websocket .............................   07:30:46   0 ms
  101    GET  /api/websocket .............................   07:30:25  78 ms
  101    GET  /api/websocket .............................   07:30:46  18 ms
  101    GET  /api/websocket .............................   07:30:25  78 ms
  101    GET  /api/websocket .............................   07:30:46  19 ms
  101    GET  /api/websocket .............................   07:30:25  78 ms

I've spent a lot of hours on trying to fix something on my proxy, but nothing works. Slowly I am thinking that there has to be an error or missing functionality on expose. Can you guys help me please?

Steps to reproduce

No response

Relevant log output